Rate of Chemical Reactions Rate of Chemical Reactions

Rate of Chemical Reactions

Rate of Chemical Reactions �The rate of reaction is a measure of how rapidly a reaction takes place. �Activation energy - is the minimum amount of energy needed for substances to react.

4 Factors That Affect The Rate Of Reaction 1. ) 2. ) 3. ) 4. ) Temperature Concentration Surface Area Presence of a Catalyst/Inhibitor

Temperature �An increase in temperature increases the rate of a reaction. �Particles of reactants will move faster and collide more frequently and with more energy.

Solid + Energy = ? �When energy is added to solids, they become liquids! �Examples?

Liquid + Energy = ? �When energy is added to liquids, they become gases! �Examples?

Add or Subtract Energy. . . �When energy is added, particles move faster! �When energy is taken away, particles move slower!

Add or Subtract Energy. . .

Concentration �Concentration - has a lot of solute dissolved into the solvent. �Increasing the concentration of reactants increases the rate of a reaction.

Surface Area �Increasing the surface area of the solid increases the chances of collision taking place. �The more finely divided the solid is, the faster the reaction happens.

Catalyst �Catalyst - a substance that initiates or accelerates a chemical reaction without itself being affected. �A catalyst lowers the activation energy.

Inhibitor �Inhibitor is a substance that slows down or stops a chemical reaction.

Endothermic Reaction �Endothermic reaction - is a chemical reaction in which energy is absorbed.

Exothermic Reaction �Exothermic reaction - is a chemical reaction in which energy is released or removed.

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